Add some unit tests usings docker and bats

Tests can be run with ./run-tests.sh

.gitmodules

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+[submodule "test/bats"]
+	path = test/bats
+	url = https://github.com/bats-core/bats-core.git
+[submodule "test/test_helper/bats-support"]
+	path = test/test_helper/bats-support
+	url = https://github.com/bats-core/bats-support.git
+[submodule "test/test_helper/bats-assert"]
+	path = test/test_helper/bats-assert
+	url = https://github.com/bats-core/bats-assert.git

run-tests.sh

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+#!/usr/bin/env bash
+
+SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
+
+docker build --tag jenv:tests $SCRIPT_DIR/test
+
+docker run --mount type=bind,source=$SCRIPT_DIR,target=/root/.jenv jenv:test /root/.jenv/test/bats/bin/bats /root/.jenv/test

test/Dockerfile

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+from centos:7
+
+RUN yum install -y https://cdn.azul.com/zulu/bin/zulu18.30.11-ca-jdk18.0.1-linux.x86_64.rpm
+RUN yum install -y https://cdn.azul.com/zulu/bin/zulu18.28.13-ca-jdk18.0.0-linux.i686.rpm
+RUN yum install -y https://cdn.azul.com/zulu/bin/zulu11.56.19-ca-jdk11.0.15-linux.x86_64.rpm
+RUN yum install -y java-11-openjdk.x86_64
+RUN yum install -y java-1.6.0-openjdk.x86_64
+RUN yum install -y java-1.7.0-openjdk.x86_64
+RUN yum install -y java-1.8.0-openjdk.x86_64
+RUN yum install -y java-1.8.0-openjdk.i686
+RUN curl -L https://github.com/graalvm/graalvm-ce-builds/releases/download/vm-20.3.4/graalvm-ce-java11-linux-amd64-20.3.4.tar.gz | tar xzf - -C /usr/lib/jvm/
+RUN curl -L https://github.com/graalvm/graalvm-ce-builds/releases/download/vm-21.3.0/graalvm-ce-java11-linux-amd64-21.3.0.tar.gz | tar xzf - -C /usr/lib/jvm/
+
+RUN echo 'export PATH="$HOME/.jenv/bin:$PATH"' >> ~/.bash_profile
+RUN echo 'eval "$(jenv init -)"' >> ~/.bash_profile
+

test/adding_jdks.bats

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+#!/usr/bin/env bats
+
+setup() {
+  load 'test_helper/bats-support/load'
+  load 'test_helper/bats-assert/load'
+
+  export PATH=$HOME/.jenv/bin/:$PATH
+  eval "$(jenv init -)"
+
+  jenv global --unset
+  jenv shell --unset
+  rm -f ~/.jenv/versions/*
+}
+
+@test "add openjdk 1.6.0.41" {
+  jenv add /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.41.x86_64/jre/
+
+  run jenv versions
+  assert_line --regexp '^ *1.6$'
+  assert_line --regexp '^ *1.6.0.41$'
+  assert_line --regexp '^ *openjdk64-1.6.0.41$'
+}
+
+@test "add openjdk 1.7.0.261" {
+  jenv add /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.261-2.6.22.2.el7_8.x86_64/jre/
+
+  run jenv versions
+  assert_line --regexp '^ *1.7$'
+  assert_line --regexp '^ *1.7.0.261$'
+  assert_line --regexp '^ *openjdk64-1.7.0.261$'
+}
+
+@test "add openjdk 1.8.0.322" {
+  jenv add /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.322.b06-1.el7_9.x86_64/jre/
+
+  run jenv versions
+  assert_line --regexp '^ *1.8$'
+  assert_line --regexp '^ *1.8.0.322$'
+  assert_line --regexp '^ *openjdk64-1.8.0.322$'
+}
+
+@test "add zulu 11" {
+  jenv add /usr/lib/jvm/zulu-11/
+
+  run jenv versions
+  assert_line --regexp '^ *11$'
+  assert_line --regexp '^ *11.0$'
+  assert_line --regexp '^ *11.0.15$'
+  assert_line --regexp '^ *zulu64-11.0.15$'
+}
+

test/bats

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+Subproject commit 5c964bbc76d0b6d616df3b3dc984fcb25ba2d485

test/setting_versions.bats

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+#!/usr/bin/env bats
+
+setup() {
+  export PATH=$HOME/.jenv/bin/:$PATH
+
+  eval "$(jenv init -)"
+  jenv global --unset
+  jenv shell --unset
+  rm -f ~/.jenv/versions/*
+}
+
+@test "global version is set globally" {
+  jenv add /usr/lib/jvm/graalvm-ce-java11-21.3.0/
+
+  jenv global 11
+  cd `mktemp -d`
+
+  [ $(realpath $(jenv javahome)) = "/usr/lib/jvm/graalvm-ce-java11-21.3.0" ]
+}
+
+@test "local is set for current directory" {
+  jenv add /usr/lib/jvm/graalvm-ce-java11-21.3.0/
+  jenv add /usr/lib/jvm/zulu-18/
+
+  jenv global 11
+
+  cd `mktemp -d`
+  jenv local 18
+
+  [ $(realpath $(jenv javahome)) = "/usr/lib/jvm/zulu-18" ]
+}
+
+@test "local is set for current directory only, reverts to global" {
+  jenv add /usr/lib/jvm/graalvm-ce-java11-21.3.0/
+  jenv add /usr/lib/jvm/zulu-18/
+
+  jenv global 11
+
+  cd `mktemp -d`
+  jenv local 18
+
+  cd `mktemp -d`
+
+  [ $(realpath $(jenv javahome)) = "/usr/lib/jvm/graalvm-ce-java11-21.3.0" ]
+}
+
+@test "shell sets for current shell" {
+  jenv add /usr/lib/jvm/graalvm-ce-java11-21.3.0/
+  jenv add /usr/lib/jvm/zulu-18/
+
+  jenv global 11
+  
+  output=$(jenv shell 18 && realpath $(jenv javahome))
+  [ $output = "/usr/lib/jvm/zulu-18" ]
+}
+
+@test "shell sets for current shell only, reverts to global outside" {
+  jenv add /usr/lib/jvm/graalvm-ce-java11-21.3.0/
+  jenv add /usr/lib/jvm/zulu-18/
+
+  jenv global 11
+  
+  $(jenv shell 18)
+
+  jenv global 11
+  [ $(realpath $(jenv javahome)) = "/usr/lib/jvm/graalvm-ce-java11-21.3.0" ]
+}

test/test_helper/bats-assert

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+Subproject commit 397c735212bf1a06cfdd0cb7806c5a6ea79582bf

test/test_helper/bats-support

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+Subproject commit 3c8fadc5097c9acfc96d836dced2bb598e48b009